Connected: An Internet Encyclopedia
RFC 1122 - 3.3.8 Error Reporting

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### 3.3.8 Error Reporting

Wherever practical, hosts MUST return ICMP error datagrams on detection of an error, except in those cases where returning an ICMP error message is specifically prohibited.

DISCUSSION:

  A common phenomenon in datagram networks is the "black hole disease": datagrams are sent out, but nothing comes back. Without any error datagrams, it is difficult for the user to figure out what the problem is.

Next: 3.4 INTERNET/TRANSPORT LAYER INTERFACE

Connected: An Internet Encyclopedia
RFC 1122 - 3.3.8 Error Reporting